When you get your amp back it is sealed with a tamper-proof foil seal. Breaking the seal voids the warranty. Although I was very curious what they had done, I wasn't curious enough to void the 4-year warranty. Good thing, too, because I had to send it back and I doubt Peter would have taken it back ( and rebuilt me another one at no expense other than shipping) if the seal was broken ( I wouldn't if I was him). My 'new' one shipped today and should arrive Thursday. As promised, I will report after install/testing.

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick